PDFKerja

Technical privacy

How PDFKerja handles your files

For Tier 1 tools, the short answer is: files never leave your browser. You can verify this yourself.

Tier 1 — never uploaded

Merge, split, rotate, reorder, delete, visual signing, and image conversion run on your device.

Tier 2 — Milestone 2

Strong compression and OCR will carry a different label because they require an ephemeral worker.

Saved signatures stay local

If you choose Save on this device, up to three signatures are encrypted with AES-GCM and stored in browser IndexedDB using a non-exportable key. They are never synced or uploaded; clearing browser site data also removes them.

Verify it in two minutes

  1. 1Open any Tier 1 tool.
  2. 2Open browser DevTools, select Network, then clear the request list.
  3. 3Choose a PDF, run the operation, and download the result.
  4. 4There is no upload request. Enable Offline mode and repeat; the tool still works.

Our automated test also fails if fixture PDF bytes appear in a network request.

Verify it now
How PDFKerja Handles Your Files | PDFKerja